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𝒞UF𝒟 \mathcal{C} \underoverset {\underset{U}{\longrightarrow}} {\overset{F}{\longleftarrow}} {\bot} \mathcal{D}
A B C D \array{ A &\longrightarrow& B \\ \downarrow &\swArrow& \downarrow \\ C &\longrightarrow& D }
Revised on July 22, 2016 12:44:03 by Anonymous (195.37.234.62)